[Vintage-Audio] JVC Speakers, Or Are They?

[Duane Fischer, W8DBF]

Greetings,   	
	
Well, whatever I purchased marked as JVC "professional silvr series" is turning
out to be quite the mystery. The model number is not one used by JVC. i had
higher up technical staff search their database back to 1980 and they can not
match the numbers or series. This is not the Japanese version, which uses
another name. This is not a bootleg knockoff either. 	
	
It is possible that these speakers were part of a high end system and the model
number is one that refers to the package, not individual pieces of it. Now being
as this pair of speakers cost $1,800, I have to wonder how many expensive
systems JVC made? But JVC has no idea without a model number, seems they made
quite a few six way systems. 		
	
I even got a dealer to check his blue book for me and they could come up with
nothing matching this system's specifications. 
	
I have researched this as far as I can, if any of you have an idea, I am
listening! 	
	
Perhaps a prototype? 	
	
Whatever they are, they sound fantastic!	
	
Now for the audio fun stuff:	
	
I tried running them off the center channel of the H.H. Scott LK-72B using the
LK-48B to power them. But alas, the LK-48B with its 20 watts continuous RMS per
channel just did not have enough oomph. I had to run her at three quarters open
on the loudness control to get adequate volume. While this is probably alright
to do, (this amplifier is totally electrically rebuilt including new tubes), I
simply did not want to risk damage.  	
	
I thought about this brand new Marantz PMA-7000 solid state integrated stereo
amp sitting here I got in the insurance settlement, and decided to put it to
work. 	
	
It does not have a mono/stereo select option as the older amps do. I fed the
center channel mono signal into the Aux. #1 right channel, wired one speaker to
the A: right channel and the other to the B: right channel. Let there be sound! 

	
I discovered that the 'speaker on/off' switch on the LK-72b turned the speakers
off alright, but it left the center channel operating. This made it easier to
adjust the Marantz amp center channel level. When I switched the main speakers
back on, the LK-72B now controlled the level of the mains and the center channel
speakers.    		
	
Wow! What incredible audio came forth. Come on over and let's play some of that
good old rock and roll. Meanwhile, help me solve this speaker mystery - 	
	
Duane W8DBF